KR20220001851A - Cooking appliance and method for controlling thereof - Google Patents

Abstract

Disclosed are a cooking appliance having an improved structure to quickly identify a failure of a cooling fan and a method for controlling the same. The disclosed invention is characterized in that whether a cooling fan is stopped is determined based on the result of monitoring a temperature increase per unit time on the inside of a cold air flow path, and when it is determined that the operation of the cooling fan is stopped, the operation of a heating unit is stopped.

Description

Cooking equipment and its control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking appliance, and more particularly, to a cooking appliance in which various electrical components are disposed in an electrical cabinet and a control method thereof.

A cooking appliance is one of home appliances for cooking food, which is installed in a kitchen space and cooks food according to a user's intention. These cooking appliances may be classified in various ways according to the type of heat source or type used, and fuel.

When cooking appliances are classified according to the type of cooking, they can be classified into open-type and closed-type cooking appliances according to the shape of a space in which food is placed. The closed cooking device includes an oven, a microwave, and the like, and the open cooking device includes a cooktop, a hob, a griddle, and the like.

The sealed cooking appliance is a cooking appliance that shields a space in which food is located and heats the shielded space to cook food. In the sealed cooking appliance, a cooking chamber is provided, which is a space that is shielded when food is placed and food is cooked. Such a cooking chamber becomes a space in which food is substantially cooked.

In the sealed cooking appliance, a door for selectively opening and closing a cooking chamber is provided rotatably. The door is rotatably installed on the main body by a door hinge provided between the main body in which the cooking chamber is formed and the door, and the cooking chamber can be selectively opened and closed by rotating around a portion coupled to the main body through the door hinge.

A heat source is provided to the inner space of the cooking compartment opened and closed by the door to heat the cooking compartment. As such a heat source, a gas burner or an electric heater may be used.

In the upper part of the cooking chamber, an electric cabinet is formed. Electrical components necessary for the operation of the sealed cooking appliance may be provided in the electrical compartment. The electric cabinet is formed as a space separated from the cooking chamber.

A cooling fan for cooling the electric vehicle room may be provided inside the electric vehicle room. The cooling fan may be provided in the form of a centrifugal fan, such as a sirocco fan, and may be disposed biasedly at the rear of the electric vehicle room. Such a cooling fan may cool the inside of the electrical cabinet by sucking in external air, and may cool the electrical cabinet by forcibly blowing hot air inside the electrical cabinet to the outside of the sealed cooking appliance.

When a failure occurs in the cooling fan as described above, it is difficult to properly cool the electric vehicle room. If the electrical equipment room is not cooled properly, the temperature of the electrical components provided inside the electrical equipment room is excessively increased, thereby increasing the possibility of failure of the electrical components.

An object of the present invention is to provide a cooking appliance having an improved structure and a control method therefor so that it is possible to quickly determine whether a failure of a cooling fan has occurred.

Another object of the present invention is to provide a cooking appliance having an improved structure and a method for controlling the same to prevent failure of electrical components due to overheating in advance.

Another object of the present invention is to provide a cooking appliance control method that can be applied to various types of ovens having different capacities and different calorific values while quickly determining whether or not a cooling fan has failed.

Another object of the present invention is to provide a cooking appliance control method that can be effectively applied to a cooking appliance in which a plurality of units are stacked in multiple stages while quickly determining whether a failure of a cooling fan has occurred.

In a cooking appliance according to an embodiment of the present invention for achieving the above object, a temperature measuring unit is installed on a supporter supporting a circuit board, a cold air flow path is formed between the cavity and the circuit board, and the temperature measuring unit measures the temperature inside the cold air flow path characterized by measuring.

As such, by determining whether or not a failure of the cooling fan has occurred based on the temperature measurement result by the temperature measuring unit, whether the failure of the cooling fan has occurred can be quickly identified.

Another aspect of the present invention is characterized in that the operation of the heating unit is controlled using the result of monitoring the temperature increase per unit time of the cold air flow path formed between the cavity and the circuit board.

Through this, it is possible to quickly detect the occurrence of a failure of the cooling fan and stop the cooking operation, thereby protecting the electronic components from failure due to overheating.

In addition, the control method of a cooking appliance according to another aspect of the present invention determines whether the cooling fan is stopped based on the result of monitoring the temperature rise per unit time inside the cooling air flow path, and when it is determined that the operation of the cooling fan is stopped, heating is performed. It is characterized in that the negative operation is stopped.

Through this, the control operation of stopping the operation of the cooking appliance when the cooling fan fails can be applied to various types of ovens having different capacities and different calorific values on the same basis.

In addition, through the above configuration, it is possible to effectively detect a failure of the cooling fan in all units of the cooking appliance in which the plurality of units are stacked in multiple stages.

Another aspect of the present invention is characterized in that it is determined that the operation of the cooling fan is stopped when the difference between the current measured value and the previously measured value for a set time is equal to or greater than the set difference value.

In another aspect of the present invention, it is determined that the operation of the cooling fan is stopped when the case where the difference between the current measured value and the previously measured value for a set time is equal to or greater than the set difference value occurs continuously for a set number of times. .

According to an aspect of the present invention, there is provided a cooking appliance comprising: a cavity having a cooking chamber formed therein, a heating unit configured to heat the cooking chamber, and an electric cabinet provided outside the cavity, the cooking appliance being disposed in the electric cabinet a circuit board to be; a supporter for separating the circuit board from the cavity and supporting the circuit board; a cooling fan for generating a flow of cold air passing through a cold air flow path that is a space surrounded by the cavity, the circuit board, and the supporter; a temperature measuring unit installed on the supporter, supported by the supporter, and measuring a temperature inside the cold air passage; and a control unit for controlling the operation of the heating unit by using the result of monitoring the increase in the temperature measured by the temperature measuring unit per unit time.

In addition, it is preferable that the control unit stops the operation of the heating unit when the rise width per unit time of the temperature measured by the temperature measuring unit exceeds a set value.

In addition, the temperature measuring unit is preferably disposed between the cavity and the circuit board.

In addition, the electric chamber is disposed above the cavity, and the supporter is disposed on the side of the circuit board and includes an air guide protruding upward from the cavity to block the side of the cold air passage, and the temperature measuring unit includes the air guide. It is preferable to be installed in

In addition, it is preferable that the electric vehicle room is disposed above the cavity, a door is disposed in front of the cavity, the cooling fan is disposed behind the door, and the temperature measuring unit is disposed between the door and the cooling fan. do.

In addition, it is preferable that the temperature measuring unit is disposed closer to the door than the cooling fan.

Also, according to another aspect of the present invention, there is provided a cooking appliance control method comprising: a monitoring step of monitoring a temperature increase per unit time in the cold air flow path; a determination step of determining whether the cooling fan is stopped based on the monitored result in the monitoring step; and an operation control step of stopping the operation of the heating unit when it is determined that the operation of the cooling fan is stopped.

In addition, the monitoring step may include: a temperature measuring step of measuring a temperature inside the cold air passage at an interval of a first set time; and a comparison step of comparing the measured value currently measured in the temperature measuring step with the measured value measured previously for a second set time longer than the first set time in the temperature measuring step.

In addition, in the determining step, if the difference between the two measured values compared in the comparing step is equal to or greater than a set difference value (Ts), it is preferable to determine that the operation of the cooling fan is stopped.

In addition, the comparing step is repeated at a third set time interval shorter than the second set time, and the determining step is continuous for more than a set number of times when the difference between the two measured values compared in the comparing step is equal to or greater than the set difference value (Ts) , it is preferable to determine that the operation of the cooling fan is stopped.

이고, 상기 제2설정시간은 5 내지 7분이고, 상기 제3설정시간은 20 내지 40초이고, 상기 설정횟수는, 2 내지 4회인 것이 바람직하다.In addition, the set difference value (Ts) is 3 to 5

and, the second set time is 5 to 7 minutes, the third set time is 20 to 40 seconds, and it is preferable that the set number of times is 2 to 4 times.

In addition, the comparison step is preferably started after the point in time when the temperature measured in the temperature measurement step is equal to or higher than the comparison start set temperature.

In addition, the comparison step is preferably started after the second set time has elapsed from the point in time when the temperature measured in the temperature measuring step is equal to or greater than the comparison start set temperature.

In addition, it is preferable that the measured value to be compared in the comparison step is a temperature equal to or higher than the comparison start set temperature.

In addition, the cooking appliance includes a first unit disposed at an upper portion and a second unit disposed below the first unit, wherein the first unit and the second unit include the cavity, the heating unit, and the cooling fan. each comprising, wherein the temperature measuring unit is disposed in the first unit, and the operation control step is performed when it is determined that the operation of at least one of the cooling fans provided in the first unit and the second unit is stopped. It is preferable to stop the operation of the heating unit.

In addition, in the comparison step, when the first unit is operated, the temperature measured in the temperature measurement step is started from a time point equal to or higher than the first comparison start set temperature, and when the second unit is operated, the temperature measured in the temperature measurement step It is preferable that the temperature is started from a time point equal to or higher than the second comparison start set temperature lower than the first set start temperature.

According to the cooking appliance and the control method thereof of the present invention, it is possible to determine whether a failure of the cooling fan has occurred based on the temperature measurement result by the temperature measuring unit, so that whether the failure of the cooling fan has occurred can be quickly determined.

In addition, the present invention can provide an effect of protecting the electrical components from failure due to overheating by quickly identifying and stopping the cooking operation when the cooling of the electrical components is not properly performed due to the failure of the cooling fan. .

In addition, the present invention can provide an effect that the control operation of stopping the operation of the cooking appliance when the cooling fan fails can be applied to various types of ovens having different capacities and different calorific values on the same basis.

In addition, the present invention can provide an effect of effectively detecting a failure of a cooling fan in all units of a cooking appliance in which a plurality of units are stacked in multiple stages, thereby safely protecting electrical components from failure due to overheating.

1 is a front perspective view illustrating a cooking appliance according to an embodiment of the present invention.
FIG. 2 is a front perspective view showing a portion of the cooking appliance shown in FIG. 1 separated;
FIG. 3 is a rear perspective view illustrating the cooking appliance shown in FIG. 2 .
4 is a front perspective view illustrating a state in which the door is removed from the cooking appliance shown in FIG. 3 .
5 is a rear perspective view illustrating a state in which some components are excluded from the cooking appliance shown in FIG. 3 .
FIG. 6 is an enlarged rear perspective view of a portion “VI” of FIG. 3 .
7 is a side view of the cooking appliance shown in FIG. 3 .
FIG. 8 is a view showing a flow of cold air in the cooking appliance shown in FIG. 7 .
9 is a configuration diagram schematically showing the configuration of a cooking appliance according to an embodiment of the present invention.
10 is a flowchart schematically illustrating a control process of a cooking appliance according to an embodiment of the present invention.
11 is a flowchart illustrating a process for detecting a failure of a cooling fan of a cooking appliance and controlling an operation of a heating unit according to an embodiment of the present invention.
12 is a flowchart illustrating in more detail a process of detecting a failure of a cooling fan of a cooking appliance according to an embodiment of the present invention.
13 is a graph showing a change in temperature inside an electric cabinet of a cooking appliance according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, it goes without saying that the first component may be the second component.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "upper (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when it is described that a component is “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components are “interposed” between each component. It should be understood that “or, each component may be “connected,” “coupled,” or “connected,” through another component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless otherwise stated, and when “C to D” is used, it means that there is no specific opposite description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

[Overall structure of cooking equipment]

1 is a front perspective view showing a cooking appliance according to an embodiment of the present invention, and FIG. 2 is a front perspective view showing a part of the cooking appliance shown in FIG. 1 separated. Also, FIG. 3 is a rear perspective view of the cooking appliance shown in FIG. 2 , and FIG. 4 is a front perspective view illustrating a state in which the door is removed from the cooking appliance shown in FIG. 3 .

Referring to FIG. 1 , a cooking appliance according to an embodiment of the present invention may include a first unit 1 disposed at an upper portion and a second unit 2 disposed at a lower portion.

In this embodiment, both the first unit 1 and the second unit 2 are exemplified as sealed cooking appliances such as an electric oven, but the present invention is not limited thereto.

For example, the configuration of the cooking appliance may be made in the form that the first unit 1 disposed on the upper part is an electric oven and the second unit 2 disposed on the lower part is a gas oven, and on the contrary, the first unit disposed on the upper part may be configured. The configuration of the cooking appliance may be made in such a way that one unit 1 is a gas oven and the second unit 2 disposed below is an electric oven.

As another example, a closed cooking appliance of a type other than an oven such as a microwave oven may be applied as the first unit 1 or the second unit 2, and an open cooking appliance such as a cooktop, hop, griddle, etc. It may be applied as the unit 1 and disposed on the second unit 2 .

Hereinafter, the configuration of the cooking appliance will be described using an example in which both the first unit 1 and the second unit 2 are electric ovens, but the configuration of the cooking appliance will be described based on the configuration of the first unit 1 . decide to do

2 to 4 , the exterior of the first unit 1 is formed by the body 10 . The body 10 may be provided in a shape including a substantially rectangular parallelepiped shape, and is formed of a material having a predetermined strength in order to protect a plurality of parts installed in the inner space.

The main body 10 may include a cavity 11 forming a skeleton of the main body 10, and a front panel 13 disposed in front of the cavity 11 to form the front surface of the main body 10 have. A cooking compartment 15 is formed inside the cavity 11 , and an opening for opening the cooking compartment 15 forward is formed inside the front panel 13 .

A cooking chamber 15 is formed inside the main body 10 . The cooking chamber 15 is made in the form of a hexahedron with an open front, and food is cooked by heating the inner space of the cooking chamber 15 in a state in which the cooking chamber 15 is shielded. That is, in the cooking appliance, the inner space of the cooking chamber 15 is a space in which food is substantially cooked.

The cooking appliance is provided with a heating unit for heating the cooking chamber 15 . As an example of the heating unit, a convection unit 18 configured to heat the inner space of the cooking compartment 15 by convection of hot air may be provided as the heating unit at the rear side of the cooking compartment 15 . In addition, an upper heater for heating the inner space of the cooking chamber 15 from the upper side may be provided as a heating unit on the upper side of the cooking chamber 11 . Also, a lower heater for heating the inner space of the cooking chamber 15 from the lower side may be provided as a heating unit at the lower side of the cooking chamber 15 .

A door 16 for selectively opening and closing the cooking chamber 15 is rotatably provided in front of the main body 10 . The door 16 may open and close the cooking chamber 15 in a pull-down manner in which the upper end rotates up and down around the lower end.

The door 16 as a whole is made in a hexahedral shape having a predetermined thickness, and a handle 17 is installed on the front side of the door 16 to hold it when the user wants to rotate the door 16 .

The control panel 20 may be provided on the upper front surface of the cooking appliance, that is, the upper front surface of the cavity 11 . The control panel 20 may form a part of the front exterior of the cooking appliance. The control panel 20 may include a knob 21 for controlling an operation of the cooking appliance and a display 22 for displaying an operating state of the cooking appliance.

Outside of the cavity 11 , an electric vehicle room 30 may be provided. The electric vehicle room 30 may be disposed above the cavity 11 and behind the control panel 20 . A space for installing electrical components may be formed in the interior of the electrical compartment 30 .

The front of the electric vehicle room 30 may be shielded by the front panel 13 . The front panel 13 may be disposed between the cavity 11 and the door 16 . At least a portion of the front panel 13 may be disposed to block the front of the electric vehicle compartment 30 . For example, the upper region of the front panel 13 disposed above the cooking chamber 15 may shield the front surface of the electric cabinet 30 .

An intake port 14 may be provided on the front panel 13 . The intake port 14 may be formed to penetrate through the front panel 13 in the front-rear direction. The intake port 14 may form a passage on the front panel 13 through which air from the outside of the electric vehicle room 30 flows into the electric vehicle room 30 .

[Structure inside the battlefield]

The upper, side, and rear boundary surfaces of the electric compartment 30 may be defined by the electric compartment cover 25 covering the electric compartment 30 from the top. And the lower boundary surface of the electric vehicle room 30 may be defined by the upper surface of the cavity (11).

FIG. 5 is a rear perspective view illustrating a state in which some components are excluded from the cooking appliance illustrated in FIG. 3 , and FIG. 6 is an enlarged rear perspective view of a portion “VI” of FIG. 3 . Also, FIG. 7 is a side view of the cooking appliance shown in FIG. 3 , and FIG. 8 is a view showing a flow of cold air in the cooking appliance shown in FIG. 7 .

In FIG. 5, the illustration of the electric vehicle chamber cover, the circuit board, the supporter, etc. is omitted. In addition, the illustration of the electric compartment cover is omitted in FIGS. 6 and 7 .

According to the present embodiment, as shown in FIG. 5 , the upper surface of the cavity 11 may include a first area 11a and a second area 11b.

The first region 11a corresponds to an approximately central portion of the upper surface of the cavity 11 , and the second region 11b corresponds to a peripheral portion surrounding the first region 11a. The first region 11a is disposed above the second region 11b, and a step may be formed between the upper first region 11a and the lower second region 11b.

Various electrical components may be disposed inside the electrical compartment 30 , as described above. As an example thereof, as shown in FIG. 6 , a circuit board 31 may be disposed inside the electric cabinet 30 . Various elements, circuits, etc. related to reception of an operation signal input through the control panel 20 and generation of a control signal for controlling the operation of the heating unit may be provided on the circuit board 31 .

The circuit board 31 may be installed in the upper portion of the cavity 11 through the supporter 35 as shown in FIGS. 6 and 7 . The supporter 35 may support the circuit board 31 while separating the circuit board 31 from the cavity 11 . For example, the supporter 35 may be installed on the upper portion of the cavity 11 , and the circuit board 31 is coupled to the supporter 35 at a position spaced upward from the cavity 11 , thereby forming a predetermined distance from the cavity 11 . They may be spaced apart.

The supporter 35 may include a support plate 36 , an air guide 37 , and a rear plate 38 .

The support plate 36 may form a plane parallel to the upper surface of the cavity 11 . The support plate 36 may be disposed to be spaced apart from the upper surface of the cavity 11 by a predetermined distance. The upper surface of the supporter 35 may be defined by a support plate 36 . That is, the support plate 36 may form the upper surface of the supporter 35 .

In this embodiment, the circuit board 31 is exemplified to be seated on the upper surface of the support plate 36 . The circuit board 31 may be accommodated in the substrate case 33 , and the substrate case 33 may be coupled to the support plate 36 while being seated on the upper surface of the support plate 36 .

A plurality of fastening protrusions 34 may be provided on the substrate case 33 . Each of the fastening protrusions 34 may be provided in the form of protruding outward in the lateral direction of the substrate case 33 . In a state in which each of the fastening protrusions 34 prepared in this way is abutted to the support plate 36 in the vertical direction, the coupling between the fastening protrusions 34 and the support plate 36 using a screw is made, so that the substrate case 33 and coupling between the support plate 36 may be made.

That is, the substrate case 33 is fixed to the upper surface of the support plate 36 , and the circuit board 31 is accommodated in the substrate case 33 , so that the circuit board 31 is attached to the upper surface of the support plate 36 . can be fixed.

The air guide 37 may be disposed below the support plate 36 , that is, between the upper surface of the cavity 11 and the support plate 36 . Also, the air guide 37 may be disposed on the side of the circuit board 31 . The air guide 37 may be formed in a plane parallel to the side surface 11c of the cavity 11 to form the side surface of the supporter 35 .

According to this embodiment, the support plate 36 may be formed to have a longer length in the front-back direction than the circuit board 31 . The air guide 37 may be formed to have a length corresponding to the length in the front-rear direction of the support plate 36 .

The air guide 37 may be coupled to the upper surface of the cavity 11 and the support plate 36 . To this end, at the lower end and upper end of the air guide 37, a lower engaging surface (37a) and an upper engaging surface (37b) may be provided, respectively.

The lower coupling surface 37a is disposed at the lower end of the air guide 37 , and may be formed in a plane parallel to the upper surface of the cavity 11 . And the upper coupling surface (37b) is disposed on the upper end of the air guide (37), it may be formed in a plane parallel to the support plate (36). For example, the lower coupling surface (37a) and the upper coupling surface (37b) may be formed in a form in which an upper portion and a lower portion of the air guide 37 are bent.

The lower coupling surface 37a may be coupled to the upper surface of the cavity 11 in a state in which it faces the upper surface of the cavity 11 . And the upper coupling surface (37b) may be coupled to the support plate (36) in a state facing the lower surface or upper surface of the support plate (36). The coupling between the lower coupling surface 37a and the cavity 11 and the coupling between the upper coupling surface 37b and the support plate 36 may be made by a screw fastening method.

As an example, in a state in which the fastening protrusion 34, the support plate 36, and the upper coupling surface 37b are disposed to overlap in the vertical direction, the fastening protrusion 34 and the support plate 36 are coupled to the top by a single screw. The combination of the cavity 11, the air guide 37, and the support plate 36 may be made in such a way that the surface 37b is fastened at once.

By the coupling between the cavity 11 and the air guide 37 and the support plate 36 made in this way, the support plate 36 is disposed to be spaced apart from the upper surface of the cavity 11 by approximately the height of the air guide 37 . can be Accordingly, the circuit board 31 supported by the support plate 36 may also be disposed to be spaced apart from the upper surface of the cavity 11 by approximately the height of the air guide 37 .

In addition, the support plate 36 may be coupled to the front panel 13 located in front thereof. For example, a portion of the upper end of the front panel 13 is bent to form a coupling surface parallel to the support plate 36 , and a portion of the support plate 36 protrudes toward the front panel 13 to form a coupling surface of the front panel 13 . can be combined with

The rear plate 38 , like the air guide 37 , may be disposed below the support plate 36 , that is, between the upper surface of the cavity 11 and the support plate 36 . Also, the air guide 37 may be disposed on the rear side of the circuit board 31 . The rear plate 38 may be formed in a plane parallel to the rear surface 11d of the cavity 11 to form the rear surface of the supporter 35 .

The rear plate 38 may be disposed between the cooling fan 40 and the circuit board 31 to be described later. The rear plate 38 may form a blocking wall blocking between the cooling fan 40 and the circuit board 31 .

Unlike the air guide 37 being seated in the first area 11a of the upper surface of the cavity 11 , the rear plate 38 may be seated in the second area 11b of the upper surface of the cavity 11 . That is, the rear plate 38 is disposed at a higher position than the air guide 37 , and this rear plate 38 may protrude higher than the circuit board 31 under the air guide 37 . The rear plate 38 may be fixed to the rear of the circuit board 31 by being coupled to at least one of the air guide 37 and the support plate 36 .

A cold air flow path 50 may be formed between the upper surface of the cavity 11 spaced apart from each other and the support plate 36 . The cold air flow path 50 may be a space surrounded by the upper surface of the cavity 11 , the support plate 36 , and the air guide 37 . The front of the cold air passage 50 is blocked by the front panel 13 , and the rear of the cold air passage 50 is blocked by the rear plate 38 .

That is, the upper surface of the cold air passage 50 is defined by the support plate 36 , the side surface of the cold air passage 50 is defined by the air guide 37 , and the front and rear surfaces of the cold air passage 50 are front panel It can be defined by (13) and the rear plate (38), respectively.

The cold air flow path 50 may be connected to the intake port 14 formed in the front panel 13 as shown in FIGS. 3 and 5 . That is, as shown in FIGS. 5 to 7 , the intake port 14 may form a passage on the front panel 13 through which air from the outside of the cooking appliance flows into the cold air flow path 50 .

In addition, the rear plate 38, the exhaust port 39 may be formed to penetrate in the front-rear direction. The cold air flow path may be connected to the exhaust port 39 , and the exhaust port 39 may form a passage on the rear plate 38 for air in the cold air flow path 50 to pass through the rear plate 38 .

The cooling fan 40 is disposed in the electric vehicle room 30 , and may be disposed on a side adjacent to the rear surface of the cavity 11 . The cooling fan 40 may include a turbofan installed on the upper surface of the cavity 11 . The cooling fan 40 may suck in air from the front of the electric cabinet 30 and discharge it to the space behind the cooking chamber 15 .

In addition, a lower through hole communicating with the rear space of the cooking chamber 15 and opened to the front may be provided at the front lower portion of the main body 10 .

Therefore, when the cooling fan 40 is operated, as shown in FIG. 8 , the outside air at the front lower part of the main body 10 enters the door 16 through the air flow hole provided at the lower part of the door 16 . inflow and rise In this process, the door 16 heated by the heat transferred from the cooking chamber 15 to the door 16 is cooled.

The air rising from the inside of the door 16 is introduced into the electric vehicle room 30 through an air flow hole provided at the top of the door 16 and an intake port 14 formed to penetrate through the front panel 13 . As such, the air introduced into the electric cabinet 30 is sucked toward the cooling fan 40 to cool the electric components disposed in the electric cabinet 20 and discharged to the rear space of the cooking chamber 15, It can be discharged forward.

Most of the air introduced into the electric vehicle room 30 through the intake port 14 , that is, cold air, may pass through the cold air flow path 50 . This flow of cold air may be guided by the air guide 37 disposed on the side of the cold air flow path 50 .

The cold air flowing into the cold air flow path 50 cools the electrical components such as the circuit board 31 supported by the supporter 35 , and exits the cold air flow path 50 through the exhaust port 39 to the cooling fan 40 . ) can be inhaled.

6 and 7, the cold air flow path 50 and the cooling fan 40 are blocked by the rear plate 38, and only the part where the exhaust port 39 is disposed is the cold air flow path 50 and the cooling fan ( 40) may be formed. Therefore, the cold air flowing into the cold air flow path 50 does not immediately exit the cold air flow path 50, but stays in the cold air flow path 50 to some extent while cooling the circuit board 31, etc., and then through the exhaust port 39. It may be discharged to the outside of the cold air flow path 50 .

Therefore, the temperature of the air introduced into the cold air flow path 50 is not the temperature of the cold air before it is introduced into the intake port 14 , but the temperature after heat exchange with the circuit board 31 , for example, the circuit board 31 . It can be said that the temperature is similar to that of

The cooking appliance of this embodiment may further include a temperature measuring unit 100 . The temperature measuring unit 100 may be provided to measure the temperature of the electrical components disposed inside the electrical equipment room 30 . In this embodiment, it is exemplified that the temperature measuring unit 100 is provided to measure the temperature of the circuit board 31 .

[Arrangement Structure of Temperature Measurement Unit]

The temperature measuring unit 100 may be installed on the supporter 35 and supported by the supporter 35 . The temperature measuring unit 100 may indirectly measure the temperature of the circuit board 31 by measuring the temperature inside the cold air flow path 50 . The temperature measuring unit 100 measures the temperature of the circuit board 31 as described above, and the result measured by the temperature measuring unit 100 is used as data for determining whether the cooling fan 40 operates. can be

In this embodiment, the temperature measuring unit 100 is exemplified as including a thermistor installed in the supporter 35 to measure the temperature inside the cold air flow path 50 .

The temperature measuring unit 100 may be disposed between the upper surface of the cavity 11 and the circuit board 31 . The vertical position of the temperature measuring unit 100 may be between the upper surface of the cavity 11 and the circuit board 31 . In addition, the position in the front-rear direction of the temperature measuring unit 100 may be a position overlapping the circuit board 31 .

Specifically, the temperature measuring unit 100 may be installed in the air guide 37 . The air guide 37 is configured to be disposed between the upper surface of the cavity 11 and the circuit board 31 . In addition, the air guide 37 is configured to be disposed on the side of the circuit board 31 and the cold air flow passage (50).

Since the temperature measuring unit 100 is installed in the air guide 37 , the temperature measuring unit 100 may be disposed between the upper surface of the cavity 11 and the circuit board 31 . And at least a portion of the temperature measuring unit 100 is formed to protrude toward the cold air flow path 50 , so that the temperature measuring unit 100 may be disposed at a position overlapping the circuit board 31 , and the temperature measuring unit 100 . ) at least a portion can be disposed inside the cold air flow path (50).

The temperature measuring unit 100 being disposed between the upper surface of the cavity 11 and the circuit board 31 and the temperature measuring unit 100 being disposed in the cold air passage 50 have the following meanings.

When cooking is performed in the cooking compartment 15 , the temperature inside the cooking compartment 15 is increased due to heat generated by the heating unit. And the temperature of the cavity 11 surrounding the outside of the cooking chamber 15 also rises. That is, when cooking is performed inside the cooking chamber 15 , the cavity 11 maintains a high temperature state.

Therefore, when the temperature measuring unit 100 is placed in contact with or very close to the cavity 11 , the temperature of the cavity 11 will have a significant influence on the temperature measurement result of the temperature measuring unit 100 . That is, a temperature substantially similar to the temperature of the cavity 11 will be measured by the temperature measuring unit 100 .

As a result, regardless of whether the cold air passes through the inside of the cold air flow path 50 , the measurement result of the temperature measuring unit 100 will be greatly affected by the temperature of the cavity 11 , so the As a result of the measurement, it is difficult to determine whether the cooling fan 40 is operating.

In addition, when the cooking appliance is operated as described above, the circuit board 31 generates heat in the course of its operation, and accordingly, the temperature of the circuit board 31 may also increase. Also, since the heat generated through the cavity 11 will affect the circuit board 31 , the temperature of the circuit board 31 rises while the cooking appliance operates.

Therefore, when the temperature measuring unit 100 is placed in contact with or very close to the circuit board 31 , the temperature of the circuit board 31 will have a significant influence on the temperature measurement result of the temperature measuring unit 100 . That is, a temperature substantially similar to the temperature of the circuit board 31 will be measured by the temperature measuring unit 100 .

As a result, regardless of whether the cold air passes through the inside of the cold air passage 50 , the measurement result of the temperature measurement unit 100 will be greatly affected by the temperature of the circuit board 31 , so the temperature measurement unit 100 As a result of the measurement, it is difficult to determine whether the cooling fan 40 is operating.

In consideration of this point, the arrangement position of the temperature measuring unit 100 is determined between the upper surface of the cavity 11 and the circuit board 31 , and is also spaced apart from the cavity 11 to some extent and the circuit board 31 to some extent. It may be determined to be spaced apart.

As an example, the temperature measuring unit 100 may be disposed at a position spaced apart from the upper surface of the cavity 11 and the circuit board 31 by the same distance, respectively. As another example, considering that the temperature of the cavity 11 is higher than the temperature of the circuit board 31 , the temperature measuring unit 100 is disposed at a position slightly closer to the circuit board 31 than the upper surface of the cavity 11 . it might be Even at this time, it goes without saying that the temperature measuring unit 100 should not come into contact with the circuit board 31 or be disposed too close to it.

On the other hand, looking at the front-rear position of the temperature measuring unit 100 , the temperature measuring unit 100 is disposed between the door 16 and the cooling fan 40 , and is more adjacent to the door 16 than the cooling fan 40 . can be placed.

According to the present embodiment, the cooling fan 40 is disposed inside the electric vehicle room 30 , and is disposed to be biased toward the rear of the electric vehicle room 30 . That is, the cooling fan 40 is disposed adjacent to the rear surface of the cavity 11 .

In addition, the circuit board 31 is disposed to be biased toward the front of the electric vehicle chamber 30 . That is, the circuit board 31 is disposed adjacent to the control panel 20 . Since the control panel 20 is disposed in front of the electric vehicle room 30 , the circuit board 31 must also be biased toward the front of the electric vehicle room 30 to connect the wiring between the control panel 20 and the circuit board 31 . This can be done simply and efficiently.

As such, as the circuit board 31 is disposed to be biased toward the front of the electric cabinet 30 , that is, closer to the door 16 than to the cooling fan 40 , the temperature measuring unit 100 is also more inclined than the cooling fan 40 . It should be placed closer to the door 16 . As such, when the temperature measuring unit 100 is disposed closer to the door 16 than the cooling fan 40 , the temperature measuring unit 100 can effectively measure the temperature inside the cold air flow path 50 , and the temperature measuring unit A design in which 100 is fixed to the supporter 35 may also be possible.

Also, as the temperature measuring unit 100 approaches the cooling fan 40 , it is more affected by the cooling fan 40 than the temperature of the circuit board 31 . That is, the measurement result of the temperature measuring unit 100 is inevitably influenced more by whether the cooling fan 40 operates than the temperature of the circuit board 31 .

In addition, when the temperature measuring unit 100 is disposed adjacent to the cooling fan 40 , it is difficult for the temperature measuring unit 100 to be installed in the supporter 35 . In order for the temperature measuring unit 100 to be disposed adjacent to the cooling fan 40 , the length of the supporter 35 in the front-rear direction must be longer than necessary or a separate structure for fixing the temperature measuring unit 100 must be added. do.

Considering this point, since the temperature measuring unit 100 is installed in the supporter 35 , more specifically, in the air guide 37 , the temperature measuring unit 100 is installed in the door 16 rather than the cooling fan 40 . It is preferable that at least a portion of the temperature measuring unit 100 is disposed in the cold air flow path 50 while being adjacently disposed.

However, it is also not preferable that the temperature measuring unit 100 is excessively adjacent to the door 16 . In the process of opening and closing the door 16 , heat from the inside of the cooking compartment 15 may be introduced into the interior of the electric cabinet 30 through the intake port 14 (refer to FIG. 5 ), and the introduced heat is generated by the temperature measuring unit 100 . It may cause distortion of measurement results.

In consideration of this point, in the present embodiment, the temperature measuring unit 100 is disposed between the intake port 14 and the cooling fan 40 , and may be disposed rearwardly spaced apart from the intake port 14 by a set interval.

In this case, the set interval may be set in consideration of the range in which the heat inside the cooking compartment 15, which is introduced into the electric cabinet through the intake port 14 during the process of opening and closing the door 16, affects.

For example, when the door 16 is opened and closed, if the area in which the temperature inside the electric vehicle compartment 30 rises rapidly is the area from the intake port 14 to about 10 mm behind it, the set interval is 10 mm. can be set.

In the present embodiment, it is exemplified that the set interval is greater than or equal to the interval between the upper surface of the cavity 11 and the circuit board 31 (hereinafter referred to as "circuit board spacing") spaced apart from each other. For example, if the circuit board spacing is 10 mm, the set spacing may be set to 10 mm or more.

This means that the temperature measuring unit 100 should be disposed to be spaced apart from the intake port 14 and that the temperature measuring unit 100 should be spaced apart from the intake port 14 by at least the circuit board spacing.

Typically, the circuit board 31 may be spaced apart from the cavity 11 to such an extent that it may not be directly affected by the heat of the cavity 11 . In consideration of this point, it can be assumed that the region spaced rearward from the intake port 14 by the circuit board spacing or more may not be directly affected by the heat introduced when the door 16 is opened and closed.

In consideration of this point, in the present embodiment, the temperature measuring unit 100 may be disposed to be spaced apart from the intake port 14 and the circuit board spaced apart from each other. Accordingly, it is possible to prevent the measurement result of the temperature measuring unit 100 from being affected by the heat introduced when the door 16 is opened and closed.

As another example, in the process of opening and closing the door 16 , the range in which the heat inside the cooking compartment 15 , which flows into the interior of the electric cabinet through the intake port 14 , affects is actually measured, and based on the measured result, the set interval may decide

[Configuration related to cooling fan failure detection function]

9 is a configuration diagram schematically showing the configuration of a cooking appliance according to an embodiment of the present invention.

The cooking appliance of this embodiment may include a control unit 200 as shown in FIGS. 6 to 9 . The controller 200 may control a cooking operation of the cooking appliance. For example, the controller 200 may control the operation of the heating unit and the cooling fan 40 based on an operation signal input through the knob 21 of the control panel 20 .

In addition, the controller 200 may also control the operation of the display 22 that displays the operating state of the cooking appliance. As an example, the controller 200 may be configured by a micro controller mounted on the circuit board 31 .

In addition, the control unit 200 may stop the cooking operation of the cooking appliance when the increase in the temperature measured by the temperature measuring unit 100 per unit time exceeds a set range. A detailed description thereof will be provided later.

In general, when the cooking operation of the cooking appliance is performed, the operation of the heating unit H is performed, and accordingly, the temperature of the cavity 11 and the circuit board 31 may be gradually increased. The temperature of the circuit board 31 may be increased due to heat generated by the operation of the circuit board 31 , and may also be increased due to the effect of the heat of the cavity 11 on the circuit board 31 .

While the operation of the heating unit H is performed as described above, the operation of the cooling fan 40 may also be performed. When the cooling fan 40 operates, the outside air in the front lower part of the main body 10 is introduced through the lower part of the door 16 and then discharged through the upper part of the door 16 to cool the door 16, Air discharged to the upper portion of the door 16 may be introduced into the cold air flow path 50 through the intake port 14 formed to penetrate through the front panel 13 .

The cold air flowing into the cold air flow path 50 cools the electrical components such as the circuit board 31 supported by the supporter 35 , and exits the cold air flow path 50 through the exhaust port 39 to the cooling fan 40 . ), and then discharged to the rear space of the cooking chamber 15 , may be discharged to the front of the main body 10 .

A passage between the cold air passage 50 and the cooling fan 40 is blocked by the rear plate 38, and only the portion where the exhaust port 39 is disposed. have. Therefore, the cold air flowing into the cold air flow path 50 does not immediately exit the cold air flow path 50, but stays in the cold air flow path 50 to some extent while cooling the circuit board 31, etc., and then through the exhaust port 39. It may be discharged to the outside of the cold air flow path 50 .

The cooling fan 40 and the heating unit H may be disposed in both the first unit 1 and the second unit 2 . In addition, the temperature measuring unit 100 may be disposed in at least one of the first unit 1 and the second unit 2 . In this embodiment, the temperature measuring unit 100 is illustrated as being disposed in the first unit (1).

[Cooling fan failure detection logic]

10 is a flowchart schematically showing a control process of a cooking appliance according to an embodiment of the present invention, and FIG. 11 is a flowchart showing a process of detecting a failure of a cooling fan and controlling an operation of a heating unit of the cooking appliance according to an embodiment of the present invention to be. Also, FIG. 12 is a flowchart showing in more detail a process of detecting a failure of a cooling fan of a cooking appliance according to an embodiment of the present invention, and FIG. 13 is a temperature change trend inside the electric cabinet of the cooking appliance according to an embodiment of the present invention. is a graph showing

Hereinafter, a cooling fan failure detection logic of the cooking appliance according to the present embodiment will be described with reference to FIGS. 8 to 13 .

8 to 10 , when the cooking appliance is operated in the first setting mode, the heating unit H is operated, and accordingly, the temperature measuring unit 100 may also be operated. Here, the first setting mode may be various cooking operations of the cooking appliance or self-cleaning operations. Hereinafter, a logic for detecting a failure of a cooling fan of the cooking device will be described using an example when the self-cleaning operation of the cooking device is performed.

The self-cleaning function of the cooking appliance is a function of automatically removing contaminants such as oil adhering (adhesive) to the wall of the cooking chamber. Self-cleaning in cooking appliances removes contaminants by heating the inside of the cooking compartment with a heat source such as the heating unit (H) to maintain the temperature inside the cooking compartment at a high temperature for a long time when contaminants such as oil are attached to the wall of the cooking compartment. It is mainly made in the form of using a pyrolysis method called pyrolysis, which is removed by burning.

While the self-cleaning function is being executed, the temperature inside the cooking chamber is maintained at a high temperature, and accordingly, the temperature of the electric cabinet 30 is also increased. Therefore, if the cooling fan 40 does not operate properly while the self-cleaning function is being executed, the temperature of the electric vehicle room 30 rises excessively, so that the temperature of the electric components provided inside the electric vehicle room 30 is excessively likely. will rise

According to the present embodiment, while the self-cleaning function is being executed, the temperature of the cooking appliance inside the electric cabinet 30 may be monitored. The temperature monitoring of the cooking appliance may be performed in the form of monitoring the temperature increase per unit time in the cold air flow path 40 using the temperature measuring unit 100 and the control unit 200 (S10). The above process (hereinafter referred to as "monitoring step (S10)") may be performed in the following way.

First, as shown in FIGS. 8 to 13 , while the self-cleaning function is being executed, the temperature measuring unit 100 measures the temperature inside the cold air flow path 50 at intervals of a first set time (S110; Hereinafter referred to as "temperature measurement step"). The shorter the first set time is, the better, for example, the first set time may be set to less than 1 second.

The temperature-related information inside the cold air flow path 50 acquired by the temperature measurement unit 100 may be transmitted to the control unit 200 at intervals as long as the first set time. The control unit 200 that has received the temperature-related information inside the cold air flow path 50 acquired by the temperature measuring unit 100 compares and sets the current measured value Tc, that is, the current temperature inside the cold air flow path 50 . It is compared with the temperature (T1, T2), and it is determined whether the current measured value (Tc) is equal to or greater than the comparison start set temperature (T1, T2).

The comparison start set temperatures T1 and T2 may be set to the temperatures of the electric cabinets 30a and 30b that are normally displayed when a cooking operation of the cooking appliance is in progress or a self-cleaning operation is performed. In this case, the comparison start set temperatures T1 and T2 may be set on the premise that the operation of the cooling fan 40 is normally performed. That is, the comparison start set temperatures T1 and T2 may be set to the temperatures of the electric cabinet that are normally displayed when the cooling fan 40 is normally operated during the cooking operation of the cooking appliance or the self-cleaning operation.

In the present embodiment, when the self-cleaning operation is performed, under the condition that the cooling fan 40 is normally operated, the temperature that can be normally measured in the cold air flow path 50 is set as the comparison start set temperature T1 and T2. is exemplified to be

According to this embodiment, the comparison start set temperature T1 when the self-cleaning operation is performed in the first unit 1 and the comparison start set temperature T2 when the self-cleaning operation is performed in the second unit 2 are They may be set differently.

When the temperature measuring unit 100 is installed only in the first unit 1 , the temperature measuring unit 100 is installed in the corresponding part in the electric compartment 30a of the first unit 1 (hereinafter referred to as “the first electric compartment”). Since the temperature of can be directly measured, there is no difference between the actual temperature of the first electric room 30a and the temperature measured by the temperature measuring unit 100 .

However, the temperature measuring unit 100 installed in this way does not directly measure the temperature of the electric compartment 30b of the second unit 2 (hereinafter, referred to as “second electric compartment”) in the second electric unit 30b. It is difficult and there is no choice but to measure the temperature of the second electric vehicle chamber 30b in an indirect manner. For example, the temperature measuring unit 100 indirectly measures the temperature of the second electric cabinet 30b by measuring the temperature of the air introduced into the first electric cabinet 30a after passing through the second electric chamber 30b. can be measured with

In this case, the temperature of the second electric vehicle room 30b indirectly measured by the temperature measuring unit 100 is inevitably lower than the actual temperature of the second electric vehicle room 30b. Heat loss occurs while the air in the second electric compartment 30b moves to the first electric chamber 30a. Accordingly, when the air in the second electric chamber 30b reaches the cold air flow path 50, this This is because the temperature of the air is inevitably lower than that in the second electric vehicle room 30b.

Therefore, if the comparison start set temperature T1 when the self-cleaning operation is performed in the first unit 1 and the comparison start set temperature T2 when the self-cleaning operation is performed in the second unit 2 are set to be the same, There may be a problem in that the control unit 200 erroneously judges the state of the second electric compartment 30b.

That is, when the self-cleaning operation is performed in the second unit 2, the temperature of the second electric compartment 30b is indirectly measured by the temperature measuring unit 100 even though the temperature of the second electric compartment 30b is equal to or higher than the comparison start set temperature T1. When it appears that the temperature of the second electric compartment 30b is less than the comparison start set temperature T1 , the control unit 200 may erroneously determine that it is not necessary to determine whether the cooling fan 40 is still in operation.

In this embodiment, when the self-cleaning operation of the first unit 1 is performed, the comparison start set temperature T1 (hereinafter referred to as “first comparison start set temperature”) is 70 to 80° C. In the self-cleaning operation, it is exemplified that the comparison start set temperature T2 (hereinafter, referred to as a “second comparison start set temperature”) is 35 to 45°C. This is that, when the temperature measured by the temperature measuring unit 100 during the self-cleaning operation of the second unit 2 is 35 to 45° C., the actual temperature of the second electric compartment 30b at this time is 70 to 80° C. that is taken into account

However, the present invention is not limited thereto, and the first comparison start set temperature T1 is the temperature of the first electric cabinet 30a, which is normally measured when the self-cleaning operation is performed in the first unit 1 , and the first electric length Various electronic components disposed in the chamber 30a may be appropriately set in consideration of a temperature range in which they may be normally operated. In addition, the second comparative start set temperature is a temperature range in which various electronic components disposed in the second electric component room 30b can operate normally, and is a first temperature range that is normally measured when a self-cleaning operation is performed in the second unit 2 . It may be appropriately set in consideration of the temperature of the electric vehicle room 30a and the like.

On the other hand, if it is determined that the current measured value Tc is equal to or higher than the comparison start set temperature in the above process, the control unit 200 compares the current measured value Tc with the previously measured value Ta for a second set time (S13; hereinafter referred to as "comparison step"). In this case, the second set time may be set to a longer time than the first set time. For example, if the first set time is less than 1 second, the second set time may be set to a time of 1 minute or more.

In this embodiment, it is exemplified that the second set time is 5 to 7 minutes, preferably 6 minutes. This is a result that reflects the following factors.

First, when the self-cleaning operation is performed in the second unit 2 , the temperature change made in the second electric vehicle room 30b is reflected in the temperature measurement result of the temperature measuring unit 100 disposed in the first electric vehicle room 30a is the time it takes to

During the self-cleaning operation of the second unit 2 , the temperature of the second electric vehicle room 30b measured indirectly by the temperature measuring unit 100 appears lower than the actual temperature of the second electric vehicle room 30b. , a time difference may occur between a time point at which a temperature change is made in the second electric chamber 30b and a time point at which the temperature change is sensed by the temperature measurement unit 100 . It takes a certain amount of time for the air in the second electric room 30b to move to the first electric chamber 30a, and it takes a certain amount of time for this air to increase the temperature of the first electric chamber 30a. Because it takes time.

Second, when a failure of the cooling fan 40 occurs, the time it takes for the temperature of the first electric cabinet 30a or the second electric chamber 30b to rise to a dangerous temperature, and the first electric cabinet 30a or It is the time during which the electrical component can operate normally or can withstand without causing a failure while the temperature of the second electrical compartment 30b rises to a dangerous temperature.

For example, if the dangerous temperature that seriously affects the performance and durability of electrical components is 120°C, the second set time is required for the temperature of the first electrical equipment room 30a or the second electrical equipment room 30b to rise to 120°C. It should be set to a time shorter than the time.

More preferably, the second set time is set for the temperature of the first electric cabinet 30a or the second electric cabinet 30b before the temperature of the first electric cabinet 30a or the second electric cabinet 30b rises to 120°C. It should be set to a time shorter than the time required to be able to suppress the temperature rise.

In addition, the second set time is shorter than the time during which the temperature of the first electric compartment 30a or the second electric compartment 30b is raised to a dangerous temperature, or the time during which the electric components can be operated normally or tolerable without causing a failure. should be set to

In this embodiment, the elapsed time and the second set time in which the above two factors are reflected are set to 5 to 7 minutes, preferably 6 minutes. However, the present invention is not limited thereto, and the second set time may be set differently depending on the size and material of the cavity, the capacity and performance of the heat source, the performance of the cooling fan, and the like.

The comparison step (S13) may be repeated at a third set time interval. It should be noted here that the comparison step (S13) is performed under the condition that the temperature measured in the temperature measurement step (S11) is equal to or greater than the comparison start set temperature.

That is, in a state in which the condition that the temperature measured in the temperature measurement step S11 is equal to or greater than the comparison start set temperature is satisfied, the comparison between the current measured value Tc and the previously measured value Ta for the second set time can be made. have.

If the current measured value Tc is measured to be less than the comparison start set temperature in the process of repeating the comparison step (S13), the progress of the comparison step (S13) may be stopped.

The third set time may be set to be longer than the first set time and shorter than the second set time. For example, if the first set time is less than 1 second and the second set time is set to 6 minutes, the third set time may be set to a time of 1 second or more and less than 6 minutes.

In this embodiment, it is exemplified that the third set time is 20 to 40 seconds, preferably 30 seconds. This is the result of the design so that the comparison step (S13) can be repeated about 2 to 4 times for about 1 minute. A detailed description thereof will be provided later.

In addition, the comparison step (S13) is preferably started after the second set time has elapsed from the point in time when the temperature measured in the temperature measuring step (S11) is equal to or higher than the comparison start set temperature. This is because it is preferable that both measured values to be compared in the comparison step ( S13 ) are values equal to or higher than the comparison start set temperature.

During the cooking operation of the cooking appliance or the self-cleaning operation, the temperature of the electric cabinet 30a and 30b is increased due to heat generated by the heating unit H while the operation is continued. In general, the temperature of the electric compartments 30a and 30b rises rapidly until reaching the comparative start set temperatures T1 and T2, but rises very gently after reaching the comparative start set temperatures, and then increases after a certain point. tends to be maintained at a constant temperature.

Considering that the temperature of the electric cabinets 30a and 30b, which is normally displayed when the cooking operation of the cooking appliance is in progress or the self-cleaning operation is performed, is set as the comparison start set temperature, the temperature of the electric cabinet 30a, 30b is the comparative start set temperature. After the temperature is reached, it is difficult to greatly change the temperature of the electric cabinets 30a and 30b.

Therefore, if the previously measured value Ta among the two measurement values to be compared in the comparison step S13 is a value that is less than or equal to the comparison start set temperature, the difference between the two measurement values to be compared in the comparison step S13 is large. likely to appear This difference is not generated depending on whether the cooling fan 40 is stopped, but simply the temperature rise gradient at the measurement time of the current measured value Tc and the temperature rise gradient at the measurement time of the previous measured value Ta It is likely that this is due to differences between them.

Considering this, in order to accurately determine whether the cooling fan 40 is stopped using the difference between the current measured value Tc and the previous measured value Ta, the comparison target is selected in the comparison step S13. It will be said that it is preferable that both measured values to be measured are more than the comparison start set temperature.

While the monitoring step (S10) including the comparison step (S13) is repeated, the control unit 200 determines whether the cooling fan 40 is stopped based on the monitored result in the monitoring step (S10) (S20; Hereinafter, referred to as "determination step").

In the determining step (S20), if the difference between the two measured values compared in the comparison step (S13), that is, the current measured value (Tc) and the previous measured value (Ta) is greater than or equal to the set difference value (Ts), the cooling fan 40 ) it can be determined that the operation is stopped (S21).

More specifically, when the difference between the two measured values compared in the comparison step S13 is greater than or equal to the set difference value (Ts) continuously for more than a set number of times, the control unit 200 stops the operation of the cooling fan 40 It can be determined that it is (S23). In this embodiment, the set difference value (Ts) is exemplified as being 3 to 5 °C, and the set number of times is 2 to 4 times.

As described above, when the cooling fan 40 is operating normally, the temperature change of the electric cabinets 30a and 30b is changed after the temperature of the electric cabinets 30a and 30b reaches the comparison start set temperature. It is difficult for large That is, if the operation of the cooling fan 40 is normally performed, the amount of change in temperature of the electric cabinets 30a and 30b during the second set time generally does not exceed 1°C.

Therefore, if the amount of temperature change in the electric cabinets 30a and 30b during the second set time significantly exceeds 1° C., it may be suspected that the electric chambers 30a and 30b are not properly cooled. In addition, the main reason that the cooling of the electric compartments 30a and 30b is not performed properly can be said to be a failure of the cooling fan 40 .

In consideration of this point, in the determination step S20 of the present embodiment, when the difference between the two measured values compared in the comparison step S13 is equal to or greater than the set difference value Ts, it is determined that the operation of the cooling fan 40 is stopped. In addition, in this embodiment, considering that the temperature change amount of the electric cabinets 30a and 30b for the second set time, that is, about 6 minutes, usually does not exceed 1°C, the set difference value (Ts) is 3 to 5°C , more preferably at 4°C.

If the set difference value (Ts) is set to less than 3 ℃, the effect of the measurement error of the temperature measuring unit 100 and the effect of the instantaneous operation change of the heating unit (H) and the cooling fan 40 will act together. In this case, the risk of an error occurring in the determination of the controller 200 may increase. Conversely, if the set difference value (Ts) is set to a value exceeding 5°C, there is a risk that whether or not the operation of the cooling fan 40 is stopped is detected too late or it is difficult to properly grasp.

In consideration of this point, the set difference value Ts may be appropriately selected as a value corresponding to the lowest temperature among values that appear when it is certain whether the cooling fan 40 is stopped.

In addition, in the present embodiment, when the difference between the two measured values compared in the comparison step S13 is equal to or greater than the set difference value Ts (hereinafter referred to as "high temperature sensing state"), the set number of times, that is, 2 to 4 times It is determined that the operation of the cooling fan 40 is stopped only when the abnormality is continuously generated.

Even if the set difference value Ts is set to a value that appears when it is certain whether the cooling fan 40 is stopped, due to a measurement error of the temperature measuring unit 100, the two measurements compared in the comparison step S13 There may be cases where the difference between values appears to exceed the set difference value (Ts).

In this case, if it is immediately determined whether the cooling fan 40 is stopped, the controller 200 indicates that the cooling fan 40 has stopped operating even though the cooling fan 40 is not actually stopped. A phenomenon in which the cooking operation or self-cleaning operation of the cooking appliance is stopped may occur. If this phenomenon is repeated, it is difficult to properly operate the cooking appliance, such as a re-operation or a self-cleaning operation, and adverse effects are inevitably applied to the reliability of the appliance.

In consideration of this point, in the present embodiment, it is determined that the operation of the cooling fan 40 is stopped only when the high-temperature sensing state occurs continuously at least twice or more.

If the failure of the temperature measuring unit 100 does not occur, it is difficult to continuously repeat the case of the high temperature sensing state due to a temporary measurement error of the temperature measuring unit 100 . Furthermore, it will be said that it is impossible for the high-temperature sensing state to occur continuously three or more times due to a temporary measurement error of the temperature measuring unit 100 . Therefore, if the high-temperature sensing state occurs three or more times continuously, it will be reasonable to determine that the operation of the cooling fan 40 is stopped.

If the set number of times is set to 5 or more, the accuracy of determining whether the cooling fan 40 is stopped is not much higher than when the set number of times is 2 to 4 times, and it is necessary to determine whether the cooling fan 40 is stopped Only the time it takes is increased. As the time required for determining whether the cooling fan 40 is stopped is increased, the time the electronic components are exposed to a high-temperature environment increases, and accordingly, the probability of failure of the electronic components increases.

In consideration of this point, in the present embodiment, the setting number is set to 2 to 4 times, preferably 3 times. Accordingly, it is possible to quickly and accurately determine whether the cooling fan 40 is stopped.

If the difference between the current measured value (Tc) and the previous measured value (Ta) is equal to or less than the set difference value (Ts) during the determination step (S20), the counting of the set number of times is initialized, and the cooling fan (40) The fault detection logic can be restarted from scratch.

When all of the conditions necessary for determining the operation stop of the cooling fan 40 are satisfied in the determination step (S20), the controller 200 considers that the operation of the cooling fan 40 is stopped (S25), and the operation of the cooking appliance to stop (S30). If it is determined that at least one of the cooling fan 40 of the first unit 1 and the cooling fan 40 of the second unit 2 is stopped in the determining step S20, the control unit 200 is All units in operation can be stopped. Accordingly, the operation of all the heating units (H) in operation may be stopped, and the operation of the circuit board 31 and components mounted thereon may also be stopped.

If the operation of the cooling fan 40 is stopped, when the cooking operation of the cooking appliance is continued, there is a high possibility that the temperature of the electrical components such as the circuit board 31 is excessively increased. If this state is continuously maintained, it is not preferable that the cooking operation of the cooking appliance continues when the failure of the cooling fan 40 occurs because the failure of electrical components may occur.

In consideration of this point, in the present embodiment, when it appears that a failure of the cooling fan 40 has occurred, the operation of the cooking appliance may be stopped. Accordingly, even if the cooling of the electrical components is not properly performed due to the failure of the cooling fan 40, the temperature of the electrical components is excessively increased or failure of the electrical components can be prevented in advance. .

In addition, since it can be determined whether a failure of the cooling fan 40 has occurred based on the temperature measurement result by the temperature measuring unit 100 , it can be quickly determined whether a failure of the cooling fan 40 has occurred.

That is, in the cooking appliance of this embodiment, when the cooling of the electrical components is not properly performed due to a failure of the cooling fan 40, it is quickly identified and the cooking operation is stopped, thereby protecting the electrical components from failure due to overheating. effect can be provided.

In addition, it should be noted in the present embodiment that the failure of the cooling fan 40 is determined according to the degree of the temperature increase per unit time. This is different from determining whether the cooling fan 40 is malfunctioning depending on whether the temperature of the electric cabinets 30a and 30b reaches a specific temperature.

The method of determining whether the cooling fan 40 is malfunctioning depending on whether the temperature of the electric cabinets 30a and 30b reaches a specific temperature is difficult to apply to various types of ovens having different capacities and different calorific values on the same basis. This is because a difference may occur in the temperature of the electric cabinets 30a and 30b, which appears when the cooling fan 40 fails, depending on the capacity and calorific value of the oven, conditions under which the electric chambers 30a and 30b are cooled, and the like.

In order to apply the method of determining whether the cooling fan 40 has failed depending on whether the temperature of the electric cabinets 30a and 30b reaches a specific temperature, it is determined whether the cooling fan 40 has failed for each type of oven. The setting of the standard temperature (hereinafter referred to as the "maximum set temperature") must be set differently.

That is, the method of determining whether the cooling fan 40 is malfunctioning depending on whether the temperature of the electric cabinets 30a and 30b reaches the set maximum temperature is inconvenient in that the set maximum temperature must be set separately for each type of oven. cause to

In addition, as a method of determining whether the cooling fan 40 is malfunctioning depending on whether the temperature of the electric cabinets 30a and 30b reaches the set maximum temperature, as illustrated in this embodiment, the first unit 1 and the second When the units 2 are stacked in two stages, it is difficult to detect a failure of the cooling fan 40 installed in the second unit 2 disposed below.

The temperature of the electric chambers 30a and 30b of the second unit 2 measured by the temperature measuring unit 100 disposed in the first unit 1 is actually the electric chamber 30a, 30b of the second unit 2 . ) because it is measured lower than the temperature.

When the set maximum temperature is based on the temperature of the electric cabinets 30a and 30b of the first unit 1, it is measured by the temperature measuring unit 100 even when the cooling fan 40 of the second unit 2 fails. It is difficult for the temperature to reach the set maximum temperature. As a result, even if a failure of the cooling fan 40 of the second unit 2 occurs, the failure of the cooling fan 40 may not be detected.

In consideration of this point, the set maximum temperature during operation of the first unit 1 and the maximum set temperature during operation of the second unit 2 may be separately set. However, when the first unit 1 and the second unit 2 are operated simultaneously, it is difficult to detect a failure of the cooling fan 40 of the second unit 2 even in this way.

In contrast, in the present embodiment, the failure of the cooling fan 40 is determined according to the degree of the temperature increase per unit time. That is, the cooking appliance of the present embodiment determines whether the cooling fan 40 is malfunctioning by determining whether the difference between the two measured values measured with a time difference by the second set time is equal to or greater than the set difference value (Ts) (Ts). can be discerned.

Even for ovens with different capacities and different calorific values, the temperature rise per unit time is not significantly different for each of these ovens. Even in ovens with different capacities and different calorific values, in most types of ovens, the changes in the temperature of the electric cabinets 30a and 30b after reaching the comparative start preset temperature tend to show similar patterns.

In consideration of this, the cooking appliance of the present embodiment determines whether the cooling fan 40 has failed according to the degree of the temperature rise per unit time, thereby stopping the operation of the cooking appliance when the cooling fan 40 malfunctions. This allows the same standard to be applied to various types of ovens with different capacities and calorific values.

In addition, the cooking appliance of this embodiment prevents the failure of the cooling fan 40 installed in the second unit 2 disposed below in the cooking appliance in which the first unit 1 and the second unit 2 are stacked in two stages. can be effectively identified.

According to the present embodiment, as long as the current temperature is equal to or greater than the comparative start set temperature, whether the cooling fan 40 has failed is determined based on the temperature rise value per unit time regardless of the current temperature.

For example, when the cooling fan 40 malfunctions during the operation of the second unit 2 , the temperature measured by the temperature measurement unit 100 operates normally with the cooling fan 40 during the operation of the first unit 1 , Even if it is lower than the temperature measured by the temperature measuring unit 100 in this case, as long as the temperature rise value per unit time is equal to or greater than the set difference value (Ts), the cooking appliance of this embodiment recognizes that the cooling fan 40 has stopped working, It is possible to stop the operation of the cooking appliance.

In summary, in the control method of the cooking appliance exemplified in this embodiment, the control operation to stop the operation of the cooking appliance when the cooling fan 40 malfunctions can be applied to various types of ovens having different capacities and calorific values, as well as the same standard. , the first unit (1) and the second unit (2) can provide an effect of effectively identifying the failure of the cooling fan 40 in all units of the cooking appliance stacked in two stages.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

10: body
11: cavity
11a: first area
11b: second area
11c: side
11d: back
13: front panel
14: intake port
15 : galley
16 : door
17 : handle
18: convection part
20: control panel
21 : knob
22: display
25: electric compartment cover
30: battlefield
31: circuit board
33: substrate case
34: fastening protrusion
35: supporter
36: support plate
37: air guide
37a: bottom coupling surface
37b: upper coupling surface
38: rear plate
39: exhaust port
40: cold fan
50: cold air flow
100: temperature measuring unit
200: control unit

Claims (16)

A cooking appliance comprising: a cavity having a cooking compartment formed therein; a heating unit configured to heat the cooking compartment; and an electric cabinet provided outside the cavity;
a circuit board disposed in the electric vehicle room;
a supporter for separating the circuit board from the cavity and supporting the circuit board;
a cooling fan for generating a flow of cold air passing through a cold air passage that is a space surrounded by the cavity, the circuit board, and the supporter;
a temperature measuring unit installed on the supporter, supported by the supporter, and measuring a temperature inside the cold air passage; and
Cooking appliance comprising a; a control unit for controlling the operation of the heating unit by using the result of monitoring the rise of the temperature measured by the temperature measuring unit per unit time.
According to claim 1,
The control unit may be configured to stop the operation of the heating unit when an increase in the temperature measured by the temperature measuring unit per unit time exceeds a set value.
According to claim 1,
The temperature measuring unit is disposed between the cavity and the circuit board.
According to claim 1,
The electric chamber is disposed above the cavity,
The supporter includes an air guide disposed on the side of the circuit board and protruding upward from the cavity to block the side of the cold air flow path,
The temperature measuring unit is a cooking appliance installed in the air guide
According to claim 1,
The electric chamber is disposed above the cavity,
A door is disposed in front of the cavity,
The cooling fan is disposed behind the door,
The temperature measuring unit is disposed between the door and the cooling fan.
6. The method of claim 5,
The temperature measuring unit is disposed closer to the door than the cooling fan.
A cooking appliance control method for controlling the operation of the cooking appliance according to any one of claims 1 to 6, comprising:
a monitoring step of monitoring the temperature increase per unit time in the cold air flow path;
a determination step of determining whether the cooling fan is stopped based on the monitored result in the monitoring step; and
and an operation control step of stopping the operation of the heating unit when it is determined that the operation of the cooling fan is stopped.
According to claim 7, wherein the monitoring step,
a temperature measuring step of measuring a temperature inside the cold air passage at intervals of a first set time; and
and a comparison step of comparing the measured value currently measured in the temperature measuring step with the measured value measured previously for a second set time longer than the first set time in the temperature measuring step.
9. The method of claim 8,
In the determining step, if a difference between the two measured values compared in the comparing step is equal to or greater than a set difference value (Ts), it is determined that the operation of the cooling fan is stopped.
10. The method of claim 9,
The comparison step is repeated at a third set time interval shorter than the second set time,
In the determining step, when the difference between the two measured values compared in the comparison step is greater than or equal to a set difference value (Ts) continuously for a set number of times or more, it is determined that the operation of the cooling fan is stopped.
11. The method of claim 10,
The set difference value (Ts) is 3 to 5 ℃,
The second set time is 5 to 7 minutes,
The third set time is 20 to 40 seconds,
The set number of times is 2 to 4 cooking appliance control method.
9. The method of claim 8,
The comparison step is a cooking appliance control method that is started after a point in time when the temperature measured in the temperature measurement step is equal to or greater than the comparison start set temperature.
13. The method of claim 12,
The comparing step is a cooking appliance control method that is started after the second set time has elapsed from a point in time when the temperature measured in the temperature measuring step is equal to or greater than the comparison start set temperature.
13. The method of claim 12,
The measurement value to be compared in the comparison step is a temperature equal to or higher than the comparison start set temperature.
9. The method of claim 8,
The cooking appliance includes a first unit disposed on the upper portion, and a second unit disposed under the first unit,
The first unit and the second unit each include the cavity, the heating unit, and the cooling fan,
The temperature measuring unit is disposed in the first unit,
In the operation control step, when it is determined that the operation of at least one of the cooling fans provided in the first unit and the second unit is stopped, the operation of the heating unit is stopped.
The method of claim 15, wherein the comparing step,
When the first unit is operated, the temperature measured in the temperature measuring step is started from a time point equal to or higher than the first comparison start set temperature,
When the second unit is operated, the cooking appliance control method is started from a point in time when the temperature measured in the temperature measuring step is equal to or higher than a second comparison start set temperature lower than the first start set temperature.

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